Bending jig



Patented dan. I6, 1923.

STATES PATENT @Fiiitlil FREDERICK C. FISCHER, OF BERWYN, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

BENDING JIG.

Application filed October 24, 1919.

f( 10 all whom t may concern Be it known that I, FREDERICK C. FISCHER, a citizen of the United States, residing at Berwyn, in t-he county of Cook, State of Illinois, have invented certain new and useful Improvements in Bending Jigs, of which the following is a full, clear, concise, and exact description.

My present invention relates to special tools and machinery for carrying out manufacturing operations and more particularly to forming jigs.

An object ot this invention is a simple and convenient jig for bending to the required angle the lead-in wires of electric lamps or vacuum tubes.

To these and other ends the invention consists in certain improvements and combinations ot' parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings, Figure l is a perspective view of a bending j ig constructed in accordance with and illustrating one embodiment of my invention, showing the workpiece in place thereon, and,

Figure 2 is a perspective. view partially broken away of the finished article in the manufacture of which the jig is utilized.

The stem A of the tube B contains the lead wires C, D, E, F, and Gr, which are individually bent into various forms to connect with the plates H, the grid K and the filament L as they emerge from the pressed top of the stem in which they are anchored. The stem is also provided with an offset extension or post M carrying the various supporting wires N for the parts to which the lead-in wires are connected.

The wires acted upon by the present device are the filament wires D and F which are bent in opposite direction substantially at right angles to the stem A. In the practice ot my invention, I provide a standard il adapted to be secured to the workbench by screws 2 and carrying at its upper end a horizontal oiiset arm or anvil 3. The upper face a of this anvil constitutes a bending face and the lower tace 5 a guage and extending between said faces are three laterally opening grooves or seats 6 of a depth preferably Serial No. 332,910.

considerably greater than the diameters of the lead-in wires.

In use, the stem is placed upon the arm or against it as shown in Figure l, by a lateral motion that inserts the wires D, E and F in the grooves 6, the central grooves being merely for the purpose of idly accommodating the central supportina wire E. The grid and plate wires C and will usually have been bent to the required form shown at aprevious operation and the under or guage face of the arm 3 has rounded notches 7 cut therein to accommodate the bends of these wires. The wires D and F occupy t-he outer slots 6 and project therefrom to a degree determined by the contact of the upper end of the tube A with the surface 5. Their ends are then bent down flat against the anvil face i in opposite directions, as shown. This permits all of the lead-in wires to be disengaged laterally in the same manner in which they are inserted. The bent ends of the wires D and F may be then twisted aroundto their accurate positions without disturbing the angle of the bends.

lith a device constructed in accordance with my invention this special work can be performed rapidly with safety and accuracy.

Vhat is claimed is:

l. A bending jig for the lead-in wires of vacuum tubes comprising an anvil having a guage face on one side of a conformation to receive and abut the end of the stem ot the tube and its attachments, a bending face on the opposite side and laterally opening grooves for the wires extending between said faces.

2. A bending jig for the lead-in wires oi' a vacuum tube, comprisingan anvil having on one side a gauge face ot a conformation to receive and abut the end of the stem of the tube. and having on another side a. bending tace 'for said wires.

3. A bending jig tor the lead-in wires oi a vacuum tube comprising an anvil having on one side thereof laterally opening seats for the lead-in wires, and having a bending face on another side thereof at right angles to said iirst side. l

et. A bending jig for the lead-in wires ci' a vacuum tube comprising an anvil having awww on one side laterally opening grooves for the lead-in Wires, and having a bending' -face on another side thereofl for said Wires, said anvil being so proportioned as to accurately deine the position of the end of the stein of said tube with respect to said bending face.

5. A'. bending jig for the lead-in Wires of a vacuum tube comprising an anvil having on one side a gauge face of a conformation to receive and abut the end of the stem of l0 the tube7 having means for positioning the lead`-in Wires and having on another side, a bending face for said Wires.

In Witness whereof, I hereunto subscribe my nanie't'his 6 day of Oct. A. D., 1919.

FREDERICK C. FISCHER. 

